Improvement in drag-sawing machines



a W. W. GILES. Drag-Sawing Machine. No. 219,635.

Patented Sept. 16, 1879.

-N.PETERS. FHOYGLIYNGGRAHER. WASHINGTON D C UNITED STATES PATENT OFFIoE.

WILLIAM W. GILES, OF CINCINNATI, OHIO.

IMPROVEMENT IN DRAG-SAWING MACHINES.

Specification forming part of Letters Patent No. 219,635, datedSeptember 16, 1879; application filed June 2, 1879.

To all whom it may concern.-

Be it known that I, WILLIAM W. GILES, of Gincinnati,in the countyofHamilton and State of Ohio, have invented certain new and usefulImprovements in Drag-Sawing Machines; and I do hereby declare thefollowing to be a full, clear, and exact description of the same, whichwill enable others skilled in the art to which it appertains to make anduse it, reference being had to the accompanying drawings, forming partof this specification, in which- Figure 1 is a perspective view of thema chine constructed in accordance with my invention, and Fig. 2 is atop-plan view of the same.

Similar letters of reference denote the same parts in the severalfigures of the drawings.

My invention relates to that class of portable sawing-machines whereinthe saw is reciprocated by the weight and muscular strength of theoperator, who occupies a sitting position upon a rising and falling seatof some kind, so as to move the operating-lever with his hands and feetand the weight of his body when sitting upon the seat. Such machines areusually constructed with a base frame, which is used to support theparts carrying the working mechanism, or with an elevated frame composedof several pieces bolted or mortised'together. These forms ofconstruction are defective, because the baseframe unnecessarily adds tothe weight and cost of the machine, and the jointed frame becomes looseand rickety when in use, and is therefore liable to twist or bind thesaw in the log.

My improvements in the frame are designed to overcome these defects; andto this end consist in constructing a single frame, preferably ofgas-pipe, bent or arched upward, so that its rear end shall stand uponthe ground, while the front end bears upon the log to be cut, the bendaffording sufficient space under it to receive the working parts, whichare operated by the person sitting upon a seat articulated directly uponthe frame. 4

The invention also consists in the application of the operating parts toa frame of this construction.

It also consists in connecting the treadles and operating-lever by meansof a crank-shaft and connecting-rod, for the purpose of increasin g theleverage.

In the accompanying drawings, A represents the frame, preferablycomposed of two pieces of gas-pipe secured together at intervals, andbent upward in the form of a bow or arch in'the direction of theirlength, and spread apart at their rear ends to form two legs to restupon the ground, while the front end rests upon the log to be cut. Thisconstruction produces a strong, light frame, sufliciently rigid tosupport the operating mechanism, While the upright legs prevent it fromslipping upon the ground when in use.

B is the operating-lever, pivoted between the bars of the frame, andcarrying the saw 0 at its lower end. D is a saddle, pivoted by parallelcrank-arms D to the frame in rear of the lever. E is a doublecrank-shaft, having its hearings in the frame some distance in front ofthe lever and F F are treadles hung to the arms of the shaft E, andconnected by links G G to the rear side of the operatinglever under theframe.

The saddle is connected by a rod, H, to an angle-lever, I, hung betweenthe bars of" the frame in rear of the saddle, and the lever I is joinedto the operating-lever, below the point at which the links are pivotedthereto, by a rod, J.

An arm, K, rises from the crank-shaft, to which it is rigidly fastened,and is connected by a rod, L, to the operating-lever between the pivotalpoints of the links and the lever I.

To operate the machine the operator seats himself upon the saddlestraddling the frame, with his feet upon the treadles and grasping theopera-tinglever with his hands. By pressing upon the treadles with hisfeet, and pull ing back the operating-lever, the saw is thrust forward,and the saddle permitted to rise, be cause the downward push upon thetreadles pulls forward the lower end of the operatinglever through themedium of the links and their pivotal point in the rear side of thelever, and at the same time throws upward the arms of the crank-shaft,turning the. latter so that the upright arm and rod L shall assist inpull ing the lever forward. The backward pull .upon the upper end of thelever also aids in throwing the saw forward and to raise the saddleabove the frame. The saw is drawn backward when the operator throws hisweight upon the saddle and pushes forward the upper end of theoperating-lever. When this occurs the treadles are relieved of hisweight and again rise, throwing back the upright arm of the crank-shaft,while the saddle swings backward and downward, turning the angle-leverand pulling back the lower end of the operating-lever by means of theconnecting-rod J. The saw is thus rcciprocated to cut the log or otherobject to be sawed.

If desired, the crank-shaft and connections may be dispensed with, inwhich case the treadles should be pivoted to the frame at the point it;but I prefer the crank-shaft attachment, because of the increasedleverage it affords.

The legs of the frame may each be provided with a step at such height asto assist the operator in mounting to the saddle.

O is a wedge, hung between the front ends of the frame-bars, to enterthe kerf in the log, for the purpose of preventing the latter frombinding the saw, and P is a pointed pin passin g downward through one ofthe bars for dogging the machine to a log.

Having thus described my invention, what I claim is with theo1')erating-l.ever and treadles, substantially as described, for thepurpose specified.

4. The rigid frame A, constructed with the upward bend in the directionof its length, so that one end shall rest upon the ground and the otherupon the log to be cut, provided with an operatinglever within the bend,and a sad dle articulated upon said frame, so as to rise and fall aboveit.

- WILLIAM WHEETEN GILES. Witnesses:

E. A. ELLsWoRTH, W. BLAOKSTOOK.

